As a cold cathode voltage regulator it exhibits a near constant voltage drop for currents within the range 5mA to 40mA. The voltage is 150 plus or minus 5.5 Volts.
The makers identification.
The construction is of a central rod within a bright cylinder. The cylinder is closed by mica sheets top and bottom.
The classic envelope is 38 mm in diameter and, excluding the IO base pins, is 89 mm tall.
References: Data-sheet, 1040 & 3002. Type VR150/30 was first introduced in 1939. See also1939 adverts.
